Wow missed out on this!
And yes a 30Ah bank will last a LONG time (take a long time to charge, hopefully it has a 50W charger!)...
My 10Ah Anker will last for DAYS running my Note 3.
Just searched on ebay, there's a lot of 30Ah and even a 50Ah. LOL!
I would not trust those ratings as far as I could drop it on the floor guys.
It's like someone advertising a case to put on your phone that turns it into a 100 watt per channel stereo system!
Additionally, lithium-ion cells aren't to be taken lightly as far as being hazardous is concerned. That includes the charger. Could literally be playing with fire there.
Often I use mine (Anker 10Ah) under a pillow to charge my phone. Not sure if I want a potentially igniting stack of Chinese lithium cells next to my head.